In the last decades fluid flows simulations have progressively enlarged their applicability and their influence in many different research fields (general overviews can be found in [1]}, [2]}, [3]}). Nowadays Computational Fluid Dynamics (CFD) applications have reached widely spread ambits as, for example, shape optimization for naval/automotive/aerospace engineering ([4]}, [5]}), cardiovascular in real time surgery ([6]}), chemistry industrial processes ([7]}, [8]}) or weather forecasts ([9]}). While increasing the demand on reliability and usability of CFD methods, the computational capability of the employed hardware architectures are no more sufficient in terms of time consuming. For this reason the search for new efficient methods able to reduce computational time keeps on covering a relevant amount of CFD research efforts.
